GB764758A - Improvements in and relating to the protection of multi-speed electric motors - Google Patents

Improvements in and relating to the protection of multi-speed electric motors

Info

Publication number
GB764758A
GB764758A GB8618/55A GB861855A GB764758A GB 764758 A GB764758 A GB 764758A GB 8618/55 A GB8618/55 A GB 8618/55A GB 861855 A GB861855 A GB 861855A GB 764758 A GB764758 A GB 764758A
Authority
GB
United Kingdom
Prior art keywords
winding
windings
motor
speed
bimetallic element
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB8618/55A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
General Electric Co
Original Assignee
General Electric Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by General Electric Co filed Critical General Electric Co
Publication of GB764758A publication Critical patent/GB764758A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
    • H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
    • H02K11/25—Devices for sensing temperature, or actuated thereby

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • Protection Of Generators And Motors (AREA)

Abstract

764,758. Control of A.C. motors. GENERAL ELECTRIC CO. March 24, 1955 [March 24, 1954], No. 8618/55. Class 38(3) A multi-speed squirrel cage motor having a starting winding 4 as well as highspeed and low-speed running windings 5, 6, is protected against overload when operating at either speed by means of thermally-operated units 34, 39, which are associated with the windings 5, 6, respectively. For high-speed operation, switch arm 20 is engaged with terminal 22 so that the starting winding is energized through centrifugally-operated switch arm 16 and capacitor 29, and the winding 5 is connected in parallel with the winding 4. The motor circuit is completed through the heater coil 35 and bimetallic element 36 of the unit 34, and the bimetallic element 38 of the unit 39, the heater coil 45 of the second unit being omitted from the circuit. The protection of the motor thus depends principally upon the coil 35 which is chosen in view of the properties of the winding 5 with which it is associated. At a predetermined speed, the contact arm 16 moves to disconnect the starting winding 4. The switch arm 20 is moved to engage the terminal 23 for low-speed operation; and, as before, the windings 4 and 5 are energized. When the motor reaches fullspeed, however, the contact arm 16 engages contact 43 to de-energize the windings 4, 5, and to energize winding 6 through heater coil 45 and bimetallic element 38. In a modified arrangement, a single protective unit is provided with only-one bimetallic element and two heating coils connected respectively in series with the motor windings 5 and 6 (Fig. 2, not shown).
GB8618/55A 1954-03-24 1955-03-24 Improvements in and relating to the protection of multi-speed electric motors Expired GB764758A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US418259A US2752548A (en) 1954-03-24 1954-03-24 Dynamoelectric machine

Publications (1)

Publication Number Publication Date
GB764758A true GB764758A (en) 1957-01-02

Family

ID=23657375

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8618/55A Expired GB764758A (en) 1954-03-24 1955-03-24 Improvements in and relating to the protection of multi-speed electric motors

Country Status (2)

Country Link
US (1) US2752548A (en)
GB (1) GB764758A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3932789A (en) * 1973-11-05 1976-01-13 Detprotector, Inc. Current sensing protector system for A. C. motors

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3113243A (en) * 1959-02-09 1963-12-03 Sta Rite Products Inc Overload protection device
US3327192A (en) * 1963-11-19 1967-06-20 Miller J Vance Two-speed motor control
US3368130A (en) * 1965-09-13 1968-02-06 Gen Electric Electric motor winding control and protection arrangement
US4066937A (en) * 1976-01-13 1978-01-03 Lennox Industries, Inc. Control circuit for a two speed single phase motor
US4384312A (en) * 1981-07-29 1983-05-17 Tecumseh Products Company Line break protection for multispeed motor

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1961793A (en) * 1933-11-18 1934-06-05 Gen Electric Adjustable speed split phase motor
US2068559A (en) * 1936-05-29 1937-01-19 Gen Electric Single-phase multispeed motor control
US2225144A (en) * 1937-02-23 1940-12-17 Bendix Home Appliances Inc Multiple speed electric motor
US2269069A (en) * 1938-12-19 1942-01-06 Gen Motors Corp Electric motor
US2259972A (en) * 1940-01-31 1941-10-21 Westinghouse Electric & Mfg Co Split-phase motor
US2320252A (en) * 1941-01-24 1943-05-25 Metals & Controls Corp Thermostatic protective circuit
US2382983A (en) * 1942-10-28 1945-08-21 Westinghouse Electric Corp Single-phase motor control
US2689933A (en) * 1953-06-26 1954-09-21 Westinghouse Electric Corp Thermally protected two-speed motors

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3932789A (en) * 1973-11-05 1976-01-13 Detprotector, Inc. Current sensing protector system for A. C. motors

Also Published As

Publication number Publication date
US2752548A (en) 1956-06-26

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